JPH0362407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vacuum cleaner having a power control device using a switching element such as a bidirectional thyristor.

Configuration of conventional example and its problems Figures 1 to 3 show the installation part of the power control device in this conventional vacuum cleaner. 1 is a bidirectional thyristor for power control, and 2 is this bidirectional a transformer for triggering the thyristor 1;
3 is a heat radiation fin for cooling the bidirectional thyristor 1, 4 is a printed circuit board for fixing them, 5 is an electric blower, 6 is a vacuum cleaner body, 7
8 is an arrow indicating the air flow of the electric blower 5, 8 is an exhaust port formed in the vacuum cleaner body 6 to discharge the air flow 7 of the electric blower 5, 9 is a lead wire, and 10
11 is an electric blower rear support member, and 11 is an electric blower front support member. The bidirectional thyristor 1 is triggered by the transformer 2 and supplies power to the electric blower 5, but at this time it generates heat and the heat dissipation fin 3
is heated. The airflow 7 discharged from the electric blower 5 passes between the inner wall 6a of the vacuum cleaner main body 6 and the heat radiation fins 3, and is discharged from the exhaust port 8. In order to cool the power control device in this way, it is necessary to attach a heat dissipation fin 3 as a component, and it is essential that a place for attaching the heat dissipation fin 3 is provided inside the vacuum cleaner body 6. However, this had the disadvantage of making the vacuum cleaner larger.

OBJECTS OF THE INVENTION The present invention eliminates these conventional drawbacks, and makes it possible to provide a cooling effect to a power control device without having to go to the trouble of constructing a heat dissipation fin as a separate component.

Structure of the Invention The present invention uses a winding spring for driving a cord winding device for winding up a power cord as a heat dissipation fin of a power control device, and places the windup spring in a ventilation path of an electric blower to dissipate heat from the power control device. This eliminates the need to use the fin as a new part, and eliminates the need to secure space for the part inside the vacuum cleaner body.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In Fig. 4, 12 is a dust collection case, 19 is a vacuum cleaner body, an electric blower 13, and a power cord 14.
A cord winding device 15 for winding up the cord, a spiral spring 16 for rotationally driving the cord winding device 15, a spiral spring lid 17 for attaching the spiral spring 16 to the cord winding device 15, and a spiral spring cover 17 for attaching the spiral spring 16 to the cord winding device 15. It has a built-in power control device 18 that is in contact with the end surface, and a dust collection case 12 is removably connected to it via a buckle 20'. 21 is a cover that supports the front wheel 22, and 23 is a rear wheel. As shown in FIG. 5, the end surface 19a of the heat generating component 19 of the power control device 18 is brought into contact with the end surface 16a of the spiral spring 16.
20 is a lead wire connected to the power control device 18. Further, the power control device 18 is located between the inner side 15a of the cord winding device 15 and the spiral spring 16. The spiral spring cover 17 is fixed with a gap between the spiral spring 16 and the spiral spring 16 so that the exhaust gas 21' from the electric blower 13 sufficiently hits the spiral spring 16.

In the above configuration, even if the heat generating component 19 of the power control device 18 generates heat, the heat can be reliably dissipated via the spiral spring 16 which is cooled by the exhaust gas 21'. In other words, by using the spiral spring 16, which is an existing component, sufficient cooling can be achieved, so there is no need to use a new component called a heat dissipation fin.

Further, the heat generating component 19 and the spiral spring 16 may be brought into contact with each other by any fixing method such as rivets, screws, welding, etc., and the same effect can be obtained, and the contact position is the same regardless of the position of the spiral spring 16.

Effects of the Invention As is clear from the above embodiments, the present invention is capable of reliably cooling a power control device having a heating element through the spiral spring of the cord winding device, thereby preventing damage to the power control device due to heat. In addition to eliminating the need for conventional heat dissipation fins, the number of parts can be reduced.
This has an excellent effect in promoting downsizing of vacuum cleaners.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the power control device of a conventional vacuum cleaner, Fig. 2 is a plan view showing its installation state, Fig. 3 is a perspective view thereof, and Fig. 4 is a vacuum cleaner according to an embodiment of the present invention. FIG. 5 is a partially enlarged exploded perspective view thereof. 13... Electric blower, 15... Cord winding device, 16... Spring spring, 18... Power control device.

Claims (1)

[Claims] 1. A vacuum cleaner in which at least a spiral spring of a cord winding device is disposed in the ventilation path of an electric blower, and a heating element of a power control device is brought into contact with the spiral spring.